Drying-cylinder for paper-making machines.



O. W. DODGE.

DRYING-CYLINDER FOR PAPER MAKING MACHINES.

APPLICATION FILED MAILl-l, 1910. 9W3876 Patented Nov. 29, 1910v 1SHEETSSHEET 1.

0. W. DODGE. DRYING CYLINDER FOR PAPER MAKING MACHINES.

APPLICATION FILED MAR. 11, 1910.

Patented Nov. 29, 1910.

9. SEEBTSSHEET 2.

' and much heat is lost by the water of conzdeisation adhering to thewalls of the cyl- .'1n er.

[of the invention. Fig. 2

'sation'from'such drying cylinders, and will UNITED STATES PATENTOFFICE.

OTIS \VM. DODGE, 01? PORT EDWARDS,YWISCONSIN.

DRYING-CYLIINDER FOR PAPER-MAKING MACHINES.

Application filed March 11,

To all whom it may concern;

Be it known that I, O'ris \VM. DODGE, of Port Edwards, in the county ofWood and State of Wisconsin, have invented certain new and usefulImprovements in Drying- Qylinders for Paper-Making Machines; and Ihereby declare that the following is a full, clear, and exactdescription thereof, reference being had to the accompanying drawings,which form part ofthis'specification.

This invention relates to so-c'alled dryin g cylinders for paper makingand other rhachinesfin which the material is dried by passing it oversteam heated cylinders; and the object of this invention is to providee-fiicient means for withdrawing the water of condensation from suchcylinders thoroughly and eii'ectively. In Fourdrinier pa ger machineswhere the matted pulp to beried is very wet, a great deal of steam iscondensed in the cylinders, and the efficiency of such cylinders isgreatly impaired if the water of condensation remains therein. And also.a great amount of steam is wasted .by contact witlrthe water ofcondensation Various attempts have been made to remove the water ofcondensation from such cylinders and the object of my invention is toaccomplish the removal of all water of condensation quickly andeffectively, thereby economizin the' steam and greatly increasing the eciency of such cylinder.

My invention therefore consists in the novel means for removing water ofcondenbe readily comprehended upon reading the following description andby reference to the accompanying. drawings, in which I have illustratedseveral embodiments of the invention as applied to a drying cylinder.And I will summarize in the claims the features of the invention forwhich protection is desired.

In said drawing's -Figure l is a longitudinal section through aconventional form of drying cylinder showing one embodiment is an.enlarged transverse section on line 22, Fig. 1, showing the scoop indifferent positions by the aid of dotted lines; and Fig. 3 is a similarsection on line 3-3, Fig. 1. Fig. 4 is a 1011- gitudinal section ofanother embodiment of theinvention; and Fig. 5 is a cross sectionSpecification of Letters Patent.

Patented Nov. 29,1910. 1910. Serial No. 548,658.

on line 5.5, Fig. 4. Fig. 6 is a longitudirial section of a cylindershowing another embodiment of the invention; and Fig. 7 is a crosssection on line 7-7, Fig. 6.

In the drawings, 1 designates a drying cylinder which may be of anydesired kinc and is'usually constructed of some sheet metal that is agood conductor of heat, and inounted upon hollow trunnions 1, l Arrangedaxially of and within said cylinder is a drain pipe 2 which may extendthrough either trunnion; butas shown in Fig. 1-

it closed at the end. next trunnion 1 and extends through trunnion 1 andmay be connected outside the-trunnion 1 by means of a suitable notarystuiling box 2 to a drain pipe 2*, as shown. Steam can be admitted tothe cylinder 1 through either one of these hollow trunnions andexhausted through the other. In the latter case steam might be conductedthrough thetrunnion 1 and'exhausted through the-trunnion 1}, in whichcase the drain pipe 2 could discharge into the exhaust pipe. Thearrangement of the steam inlet and exhaust pipes and their connectionsto the cylinder 1 forms no part of the present invention and thereforeit is unnecessary to illustrate same; nor is it necessary to illustratethe discharge connections of the pipe 2 outside the cylinder as thiswill vary according to the construction of the machine in which thedrying cylinder is employed, and the steam connections therewith, itonly being essential that the pipe 2 shall discharge the waterofcondensation conducted theroi-nto outside of the cylinder 1.

Attached to the inner wall of the cylinder and extending longitudinallythereof, is a scoop 3, which is preferably formed of a strip. of sheet.metal bent in U-shupc; .one side of said scoop being attached to the innor wall of the cylinder as shown in Figs.

' l and 2, in any suitable way, so as to make a close joint therewith atitsedge; and the mouth of said scoop opening in the direction ofrotation of the cylinder, so that as the scoop rotates, with thecylinder, it will pick up all the water in the cylinder. The scoop ispreferably provided at suitable intervals with pockets 3 in its bottomor rear side, and these pockets in turnare connected with the pipe 2 bymeans of pipes 2 which are preferably bent on a convolute curve asshown', so that as the scoop rises at the ascending side of the cylinderthe water-will low the level or" the drain pipe '2'.

' pipe that flow from the pockets into pipes 2 and pass therethroughinto the drain pipe 2 dur- .ing the rotation of the cylinder.

As shown in l ig'L'Q the bends 2" of the pipes 2 adjacent the drain pipe2 may be such that the Waterwill be trapped in the bends. 2 as the scooprises and some water will be retained in the bends 2 and dis chargedtherefrom into pipe 2 as the scoop descends. Thus the water may bedischarging all the time through the pipes 2 into the pipe 2, and thebends therein prevent any water draining back from the pipe 2 into thetrough when the letter comes be.-

I may make some of the pipes 2 with different bends. As shown in Fig. 1every other pipe 2. has a full convolution, thebcnd being extendedbeyond the bend 2', as shown at 2,

"sofas/to connect with the. pipe 2 at the side thereof directly adjacentthe scoop 3 (see Fig. while the bends 2 connect With the at the sideopposite the scoop 2). In other words it might be said Fig.

the pipes having the. bonds 2 make a 3 (see half turn around the drainpipe 2 While the" pipes havingthe bends 2 iii nuke a full turnaround thedrain pipe 2. in this construction the pipes llll not all dischargesiinultanoously und equally into the drain pipe 2, as the pipes havingthe bends 2 will discharge into the pipe 2 practically alternntely withthe pipe having the bends 2*,"which will prevent any such accumulatio'nof water in, or sudden discharge of water into the pipe 2, as mightchose the letter or cause water to back up into the )ipes 2 inddischarge baclr into the cyliner. 'As the scoop extends the length ofthe cylinder it will be obvious that all water of condensation in thecylinder will be picked up and discharged through the pipe The cylindersare sometimes lllkHlQ'St) 7 longrthat it is n cessary to eniployinternal annular braces to stiffen them; and my invention is especiallyadsptedthertato as the scoop can be made practically continuous,intermediate the braces, or even puss therethrough as desired. I

If the cylinder is of very large diameter or the condensation therein isvery great, a plurality of scoops may be used. In Figs. 4: and 'Zytivodiametrically opposite scoops 3 aroshor-zn within the cylinder, eachcon-'nectedto the central drain pipe 2 by pipes 2 As shown in Fig. 4 thepipe 2 need not necessarily be one continuous pipe but could be made upof a series of pipe sections suitably united. i

- f course one of the features of the invention is to provide forremoving the water of condensation simultaneously substantially alongtheentire length of the cylinder, by

means of a scoop or series of scoops extendthe cylinder.

sworn in place of one continuous metal scoop 3, as shown in Figs. 1 andt, a series o short scoops 3 may be arranged close together, andpreferably in line,.longitudinall y of the cylinder, as shown in Figs. 6and 7,. each of said short scoops being connected by a pipe 2 *ith thecentral drain pipe 2.

While it would be possible to rotate the scoops Within the cylinder, Iprefer to have the scoops rotate with the cylinder, and therefore tofasten the outside edges of the scoops to the inner wall'of the cylinderas sho vn in the drawings. By reason of the curve in the pipes, asdescribed, the scoop will be in position to begin to take up Water,before any Water in the curved pipes or pipe 2 could return therefrominto the scoop, and therefore "the water of condensntion will a ways bedischarged through the pi e 2.

The inner end of the pipe 2 may e either directly supported in thestutiing box 1 or on bracket l attached to the head of the cylindershown.

As the scoop travels with the drying shell it scoops writer from thebottom of the cylinder and as it moves upward the Water flows downthrough the curved pipes and is delivered into the drain pipe which inturn discharges the water out of the cylinder.

\l hut I claim is: i l

1. In combination with a drying cylinder, an axially disposed drain pipearranged within the cylinder and extending substan tiall the len ththereof scoo in means within and extending longitudinally of thecylinder, and convolutely bent pipes for conducting water from thescooping means into said drain pipe.

2. In combination with a drying cylinder, an axially disposed drain pipearranged within the cylinder and extending longitudinally thereof,scooping means extending longitudinally of the cylinder, and convolutelybent pipes for conducting water from the scooping means into said drainpipe, some of the pipes having a greater convolute bend than others,whereby the time of discharge of said convolute pipes into the drainpipe is varied. I V

3. In'conibination with a drying cylinder, scooping means attached tothe inner wall of and extending substantially from end to end of thecylinder, admin pipe extending axially of and substantially from end toend of the cylinder, and pipes connecting said scoop with thedrain-pipe, said Connect ing pipes being bent on convolute curves,substantially as described.

In combination with a drying. cylinder,

pipes for coinlucting, water from the scoop pockets into saiddrain-pipe. 5. In combination with a drying cylinder,

siibstantially f 'oinend to end of the-cylindel, and eonVolut-ely hentpi1 es eonneoiing' said scoop with the? difain-pipe. l

(S. In eolnlnnallon with a drying cylinder;

longitudinally disposed scooping meansatiaclied to the inner wallthereof and exiending substantially from end to end of the cylinder, anaxially (lISPOSQLl drain pipe. extendlng xldmtantlally from end to endof the necting said 'sooopin'g means withihedrain IHIX SUIHO of theconnecting pipes having (their eom'olutions of greater-extent than -thatof 'the othersio vary fche time of discharge "of the pipe.

my own, I ailix my signature in prsnc' of two witnesses.

(.)TlS NM; DODGE.

, 'itnesses:

B, R. Goooms,

conwilutopipes' to the drain '1 n l'estnnony that I 'claiin theforegoing" a's-

